/****************************************************************************
 * Copyright 2009 Huascar A. Sanchez                                        *
 *                                                                          *
 * Licensed under the Apache License, Version 2.0 (the "License");          *
 * you may not use this file except in compliance with the License.         *
 * You may obtain a copy of the License at                                  *
 *                                                                          *
 *     http://www.apache.org/licenses/LICENSE-2.0                           *
 *                                                                          *
 * Unless required by applicable law or agreed to in writing, software      *
 * distributed under the License is distributed on an "AS IS" BASIS,        *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
 * See the License for the specific language governing permissions and      *
 * limitations under the License.                                           *
 ****************************************************************************/
package com.gotobject.jumpstart.graphics;

import javax.swing.SwingUtilities;
import java.awt.Window;
import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

/**
 * @author huascar.sanchez@gmail.com (Huascar A. Sanchez)
 */
public class WindowDragger {
    private Window      fWindow;
    private Component   fComponent;
    private int         dX;
    private int         dY;

    public WindowDragger(Window window, Component component) {
        fWindow = window;
        fComponent = component;

        fComponent.addMouseListener(createMouseListener());
        fComponent.addMouseMotionListener(createMouseMotionListener());
    }

    private MouseListener createMouseListener() {
        return new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                Point clickPoint = new Point(e.getPoint());
                SwingUtilities.convertPointToScreen(clickPoint, fComponent);

                dX = clickPoint.x - fWindow.getX();
                dY = clickPoint.y - fWindow.getY();
            }
        };
    }

    private MouseMotionAdapter createMouseMotionListener() {
        return new MouseMotionAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                Point dragPoint = new Point(e.getPoint());
                SwingUtilities.convertPointToScreen(dragPoint, fComponent);

                fWindow.setLocation(dragPoint.x - dX, dragPoint.y - dY);
            }
        };
    }

}

